UnityNetwork NetworkAddress setting?

I have a multiplayer game using UNET. I can connect to my own instance if i didn’t modify any networkAddress in NetworkManager. but if i change it to “localhost” or “” via text mesh input field it says

Aren’t the default value of NetworkAddress is “localhost” or am i missing something here?

The problem is, i was using text mesh pro on the child of the actual input. So it adds an invisible character on the end of the string. Such a dumb error sorry.